You're right, too much variance depending on all sorts of factors to give an accurate answer.
I pay between $6 - $14 per acre in Young, a high quality pasture in same area $10 - $18, high quality planted winter pasture $3 - $6 per AU per month.
Rough native range land in Archer $4 - $8.
You'd need to have a very good idea of how many AU the acreage will support, and either have a good knowledgeable tenant or contractually limit head count to prevent range deterioration.
I don't have any grazing leases in Throckmorton or Stephens.
I get $1.50 per head PER DAY for planted winter pasture (wheat,rye, triticale).